Product Description

The Earthquake M605 22-Inch Walk-Behind String Mower is designed for cutting tall grass, weeds and overgrown vegetation in areas where a conventional lawn mower may be less practical.

This exact Model 37676 uses a 163cc Briggs & Stratton four-cycle gasoline engine. The engine is a single-cylinder, air-cooled OHV configuration paired with a recoil starting system.

Instead of a conventional steel mower blade, the M605 uses heavy-duty nylon trimming line. The cutting head produces an approximately 22-inch cutting swath, allowing the mower to clear a relatively wide path through tall grass and weeds with each pass.

The heavy-duty replacement line used with this mower is approximately 0.155 inch in diameter, providing considerably heavier cutting material than a typical handheld residential string trimmer.

Large 14-inch airless wheels support the mower and are designed to move through uneven grass and rougher lawn areas without requiring pneumatic tire pressure maintenance. Earthquake’s parts catalog also confirms the 14-inch wheel assembly used on the 37676.

A one-piece steel deck gives the cutting platform structural support while helping control vibration around the cutting head. The open-front string-mower configuration also provides access to taller vegetation that can be difficult for a conventional enclosed rotary mower deck to reach.

Cutting height is approximately adjustable across the 1.5- to 3-inch range, allowing the cutting head to be configured for varying vegetation and finish heights.

The mower uses an adjustable handlebar with tool-free adjustment hardware. The handle can be repositioned or folded to reduce its storage and transport footprint.

Key Features

• Earthquake M605 platform
• Exact Manufacturer Model 37676
• 163cc Briggs & Stratton engine
• 4-cycle gasoline engine
• Single-cylinder OHV design
• Air-cooled engine
• Pull-cord starting
• 22-inch cutting swath
• Heavy-duty nylon cutting line
• Approx. 0.155-inch cutting-line diameter
• Approx. 1.5–3-inch cutting-height range
• One-piece steel cutting deck
• Large 14-inch wheels
• Airless / never-flat tire design
• Manual push configuration
• Adjustable handlebar
• Tool-free handle adjustment
• Foldable storage configuration
• Designed for tall grass and weeds
• Starter cutting strings supplied with documented retail configuration

Technical Specifications

The exact 37676 listing identifies a 163cc Briggs engine, 22-inch cutting width and push-drive layout; archived dimensional listings place the unit around 54.62 × 21.37 × 19.07 inches and roughly 60 lb.

Engine Configuration

163cc Briggs & Stratton

Engine Brand: Briggs & Stratton
Displacement: 163cc
Engine Type: 4-Cycle
Cylinder Configuration: Single Cylinder
Engine Design: OHV
Cooling: Air-Cooled
Starter: Pull Cord / Recoil

This is the defining engine specification for Earthquake Model 37676.

Cutting Configuration

22-Inch Cutting Swath

The cutting head provides an approximately:

22-inch cutting diameter / swath

using heavy-duty nylon mower line.

Unlike a conventional lawn mower, there is no standard rotary steel lawn-mower blade mounted beneath the deck.

String Configuration

The mower uses heavy-duty replacement trimming line approximately:

0.155 in. diameter

Earthquake replacement-line listings for compatible gas walk-behind string mowers use roughly 21.25-inch-long × 0.155-inch-diameter line segments.

Use only replacement line specified as compatible with the exact mower configuration.

Cutting Height Configuration

Published listings for Model 37676 place the usable cutting-height range at approximately:

1.5–3.0 Inches.

Wheel Configuration

14-Inch Wheels

The M605 uses:

14-inch airless / never-flat wheels

The larger wheel diameter is intended to help the mower move through taller vegetation and uneven ground more easily than a small-wheel walk-behind trimmer.

Deck Configuration

The Earthquake string mower uses a:

One-Piece Steel Deck

The steel platform supports the cutting head and provides structural rigidity while helping reduce vibration during operation.

Drive Configuration

Manual Push

The M605 is:

Not Self-Propelled

Forward movement is provided by the operator while the gasoline engine powers the string cutting head.

Handle & Storage Configuration

The mower incorporates:

Tool-Free Adjustable Handlebar Hardware

The handle can be adjusted and folded to simplify storage and transport.

What’s Included

Documented retail configurations include:

• 1 × Earthquake M605 Walk-Behind String Mower
• 163cc Briggs & Stratton engine
• 22-inch string cutting system
• 14-inch wheel assemblies
• Adjustable handle system
• Factory cutting-head assembly
• Starter trimming strings
• Product documentation
• 4-cycle engine oil where included with the original retail package

Package contents can vary by retailer or remaining legacy inventory.

Ideal Applications

The Earthquake M605 is designed for vegetation-maintenance jobs such as:

• Tall grass
• Dense weeds
• Fence lines
• Property edges
• Areas around trees
• Rough lawn sections
• Uneven maintained ground
• Areas awkward for a conventional mower

It is a string mower, not a brush cutter or conventional finish lawn mower.

Current Model Status

The Earthquake 37676 / M605 is a legacy configuration.

Ardisam’s official parts catalog identifies the machine as:

37676 EQ STRING MOWER WALK BEHIND 163CC BRIGGS

with a:

Model Year 2020 reference.

Earthquake’s current mower lineup instead features newer walk-behind string mowers such as the 40314 and 47325, which use current 160cc configurations.

Therefore, do not present Model 37676 as Earthquake’s newest 2026 model.

Important Variant Notes

Correct Model

Use:

37676 / M605

Correct Engine

Use:

163cc Briggs & Stratton

Do not use the current:

160cc Viper

specification from Earthquake 40314 or 47325.

Correct Cutting Width

Use:

22 Inches

Correct Wheel Size

Use:

14 Inches

Correct Drive Type

Use:

Manual Push

Do not advertise it as self-propelled.

Correct Cutting Head

Use:

Heavy-Duty Nylon String

not a conventional steel rotary mower blade.